Having a fixed layout may mean that a webpage has a predetermined width and height.
A fluid layout means the size of a page can vary depending on the resolution of the monitor’s device.
I believe a fluid layout is better in today’s time because there are different devices used in today’s world. You may have anything from a computer, a tablet, a smart phone, or any other device and that means that the size of the screen will be different.
An example of a fixed layout would be: http://www.boardofwisdom.com
An example of A fluid layout would be: http://www.facebook.com
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